Last Friday, Gov. Jerry Brown set another ambitious and significant marker for California: 5 million zero emission vehicles on the road by 2030. As previewed in the governor’s final State of the State speech the day before, his Executive Order calls for substantial investments in electric and fuel cell vehicles, along with the necessary infrastructure to fuel and charge them. Transportation is the next frontier in building California’s advanced energy economy, and with this action, Gov. Brown has taken a big step forward.